Edwin m



(No Model.)

B. M. CARHART.

WATER WHEEL.

No; 386,802. Patented July 31, 1888.

UNITED STATES PATENT OFFICE.

EDIVIN M. CARHART, OF PROVIDENCE, RHODE ISLAND.

WATER-WHEEL.

SPECIFICATION forming part of Letters Patent No. 386,802, dated July 31,1888.

Application filed May 16, 1887. Serial No. 238,399.

To all whom it may concern.-

Be it known that I, EDWIN M. CARHART, of Providence, in the county ofProvidence and State of Rhode Island, have invented a certain new anduseful Improvement in \Vater- Wheels, of which the following is adescription.

My present invention is an improvement on the water-wheel patented to meMarch 26, 1885, No. 318,869; and it consists in a novel constructionofcurb and the combination with the wheel; and it also consists incertain other novel combinations therewith, to be herein after morefully described.

In the accompanying drawings, Figure l is a vertical section of awater-wheel and curb embodying my improvement. Fig. 2is averticalsection of the curb. Fig. 3 is a plan or top view of the same. Fig. 4 isa transverse section taken on the plane of the dotted line 00 av, Fig.1.

Similar letters of reference designate corresponding parts in all thefigures.

A designates the body of the water-wheel.

, This wheel decreases in size toward its lower end. Blades or bucketsb, conforming to the contour of the body, extend therefrom and spirallyaround the same. Arranged in the body A and between the blades orbuckets b cavities a are formed. For a more complete description of theconstruction of this wheel I would refer to my said Letters Patent No.318,869.

B designates the curb for the wheel. As shown, this curb conforms inshape to the contour of the wheel A both internally and externally. facewith spirally-extending recesses or grooves (I. These recesses orgrooves extend, as shown, from the top nearly to the bottom of the curb.Each of these recesses or grooves comprises a spirally-extending endwall, d, and a rear wall, d the latter being of gradually-lesseningprojection from the end wall,d,of an adjacent recess to the endwall,d,of the recess in which it terminates; or, in other words,the rearwall, (1, is nearest the wheel at the end wall of the adjacent recess,where it commences, and farthest from the wheel at the end wall,d,whereit terminates. A cross-section of this curb would have the appearance ofratchet-teeth It is provided upon its inner sur-' (No model.)

upon its inner surface. These recesses or grooves extend in a reversedirection spirally to that of the spiral blades or buckets b ofthe wheelA. \Vater thrown centrifugally from the blades or buckets 1) during therotation of the wheel passes into the recesses d of the curb, and isdeflected by the end walls, d, of the recesses onto the blades orbuckets b near the lower ends ofthe latter, thereby materiallyaugmenting the power of the wheel. As the end walls, d, of the recessesare spiral, the water passing down them is thrown back with considerableforce onto the blades or buckets.

D designates a combined nozzle or outlet and a step-bearing for thelowerjournal, e, of the wheel A. The lower portion, 6, of this nozzle ishollow, and is externally screwthreaded to engage an internal screwthread on the inner surface of the curb near the lower end of thelatter.The upper portion, f,thereof, which constitutes the step'bearing, issolid, except that it is perforated or provided with apertures 9,through which water from the interior of the curb may pass into theoutletnozzle 0. I have shown four of these apertures g; butl may use anydesired number.

G designates the cap or cover for the wheel. It is provided with a hub,9', through which extends the upperjournal, e", ofithe wheel A. It isalso provided circumferentially with a downwardly-extending flange,i,which extends about the curb B. Boltsj,extcnding through lugs on thecurb or case and into the flange i, serve to secure the cover on thecurb or case. Atits upper end the curb or caseB is provided with anexternal circumferential groove or rabbet, I. Then the cap or cover G isin place, it incloses said groove or rabbet,thereby forming an annularchamber, I.

J designates an inlet'pipe opening into the annular chamber I. From theannular chamber I an opening or openings, s,communicate with theinterior of the case or shell B.

WVhat I claim as my invention, and desire to secure by Letters Patent,is

1. The combination of a water-wheel decreasing in diameter toward itslower end and provided externally with spirally-extending blades orbuckets conforming to the contour of the body, a case or curb for thewheel conforming in shape upon its interior with end with an externalcircumferential rabbet, a cap or cover provided with adownwardlyextending circumferential flange, whereby, when the cap orcover is in place, an annular chamber, as I, is formed, an inlet-pipecommunicating with said chamber, and a passage or passages from saidchamber to theinterior ofthe curb or case. substantially as specified.2o

EDWIN M. CARHART.

the shape of the wheel, said case or curb being provided internally withspirally-extending grooves or recesses having spirally-extending endwalls, (1, extending from the top nearly to the bottom of the case orcurb, said grooves or recesses and their rear walls extending spirallyin a reverse direction to that of the blades on the wheel and vanishingat their lower ends upon the surface of the curb, substantially asspecified. Witnesses:

2. The combination, with a water-wheel, of O. B. HAUXHURST, a curb orcase therefor, provided at its upper E. M. DOWNS.

